Touchard polynomial
Poor-quality diamond, used for industrial cutting or abrasion; a poorly crystallized diamond.
(falconry, heraldry) A metal ring bearing the owner's name or coat of arms, attached to a hawk's jesses. Used for identifying birds.
(mathematics) Any member of a polynomial sequence of binomial type defined by T_n(x)=∑ₖ₌₀ⁿS(n,k)xᵏ=∑ₖ₌₀ⁿn atop kxᵏ, where S(n,k)=n atop kis a Stirling number of the second kind, i.e. the number of partitions of a set of size n into k disjoint non-empty subsets.
Third-person singular simple present indicative form of intwine
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